An ice cube tray contains enough water at 22.0oC to make 18 ice cubes that each have a mass of 30.0 g. The tray is placed in a freezer that uses CF2Cl2 as a refrigerant. The heat of vaporization of CF2Cl2 is 158 J/g. What mass of CF2Cl2 must be vaporized in the refrigeration cycle to convert all the water at 22.0oC to the ice at – 5.0oC? The specific heat capacities for H2O (s) and H2O (l) are 2.03 J/g• oC and 4.18 J/g• oC, respectively, and the enthalpy of fusion for ice is 6.01 kJ/mol.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
An ice cube tray contains enough water at 22.0oC to make 18 ice cubes that each have a mass of 30.0 g. The tray is placed in a freezer that uses CF2Cl2 as a refrigerant. The heat of vaporization of CF2Cl2 is 158 J/g. What mass of CF2Cl2 must be vaporized in the refrigeration cycle to convert all the water at 22.0oC to the ice at – 5.0oC? The specific heat capacities for H2O (s) and H2O (l) are 2.03 J/g• oC and 4.18 J/g• oC, respectively, and the enthalpy of fusion for ice is 6.01 kJ/mol.
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